Poor duet set it out (9)
I believe the answer is:
destitute
'poor' is the definition.
('destitute' can be similar in meaning to 'poor')
'duet set it out' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'duet'+'set'+'it'='duetsetit'
'duetsetit' is an anagram of 'DESTITUTE'.
(Other definitions for destitute that I've seen before include "Poverty-stricken" , "Absolutely broke, without money or goods" , "Penniless, without any means" , "In utter want" , "Impoverished, indigent" .)